Answer

How to Determine the IUPAC Name of a Compound

🔹 Step 1: Identify the Parent Chain

The compound contains a carbon-carbon double bond, making it an alkene. The longest continuous chain that includes the double bond is selected as the parent chain.

• The parent chain contains 5 carbon atoms.
• Therefore, the base name is pentene.

🔸 Step 2: Number the Carbon Chain

Numbering begins from the end that gives the double bond the lowest number.

• From left to right, the double bond is between carbon 1 and carbon 2.
• This gives the name 1-pentene.

🔷 Step 3: Identify and Name Substituents

Check for any groups attached to the main chain:

• A methyl group (-CH₃) is attached to carbon 2.
• It is named as a substituent: 2-methyl.

🔶 Step 4: Assemble the IUPAC Name

Combine the substituent with the parent chain while indicating positions correctly:

• Put the substituent name first: 2-methyl.
• Then the parent chain with the double bond position: 1-pentene.